/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Colors - Adjusted for Dark Theme */
  --primary-color: #007bff; /* Blue - remains vibrant */
  --secondary-color: #adb5bd; /* Lighter Gray for secondary text */
  --accent-color: #28a745; /* Green - remains vibrant */
  --background-light: #000000; /* Black for main background */
  --background-dark: #1a1a1a; /* Very Dark Gray for sections like footer and most cards */
  --background-card-hover: #2a2a2a; /* Slightly lighter dark for card hover */
  --text-dark: #e0e0e0; /* Light Gray for main text */
  --text-light: #f8f9fa; /* White/Off-white for text on dark backgrounds */
  --border-color: #495057; /* Darker border for subtle separation */
  --shadow-color: rgba(255, 255, 255, 0.05); /* Subtle light shadow for dark background */
  --shadow-hover: rgba(0, 0, 0, 0.4); /* Darker shadow on hover for depth */


  /* Typography */
  --font-primary: 'Inter', sans-serif;
  --font-secondary: 'JetBrains Mono', monospace;
  --font-size-base: 1rem;
  --line-height-base: 1.6;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;

  /* Border Radius */
  --border-radius-sm: 0.25rem;
  --border-radius-md: 0.5rem;
  --border-radius-lg: 0.75rem;

  /* Transitions */
  --transition-fast: 0.2s ease-in-out;
  --transition-normal: 0.3s ease-in-out;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  line-height: var(--line-height-base);
  color: var(--text-dark);
  background-color: var(--background-light);
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: var(--primary-color);
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-color);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

/* Loading Screen */
#loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--background-dark);
  color: var(--text-light);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 1;
  transition: opacity var(--transition-normal);
}

#loading-screen .loader {
  text-align: center;
}

#loading-screen .earth-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-sm);
  animation: pulse 1.5s infinite alternate;
}

@keyframes pulse {
  from { transform: scale(1); }
  to { transform: scale(1.1); }
}

body.loaded #loading-screen {
  opacity: 0;
  pointer-events: none;
}

/* Header / Hero Section */
.hero-section {
  /* Adjusted gradient for dark theme */
  background: linear-gradient(135deg, #000000, #330066); 
  color: var(--text-light);
  padding: var(--spacing-2xl) 0;
  text-align: center;
  position: relative;
  overflow: hidden; /* For particles or background effects */
  min-height: 100vh; /* Make it full height */
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
}

.hero-content-wrapper {
  z-index: 1; /* Ensure content is above any background effects */
}

.avatar-container {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  overflow: hidden;
  margin: 0 auto var(--spacing-md);
  box-shadow: 0 0 0 8px rgba(255, 255, 255, 0.2);
  position: relative;
  transition: transform var(--transition-normal);
}

.avatar-container:hover {
  transform: scale(1.05);
}

.avatar {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.hero-title {
  font-size: 3.5rem;
  margin-bottom: var(--spacing-sm);
  font-weight: 700;
  line-height: 1.1;
}

.hero-title .title-prefix,
.hero-title .title-suffix {
  font-size: 0.7em;
  opacity: 0.8;
}

.hero-subtitle {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-md);
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.role-badge {
  background-color: rgba(255, 255, 255, 0.2);
  padding: 0.3em 0.8em;
  border-radius: var(--border-radius-md);
  font-size: 0.9em;
  font-weight: 500;
}

.hero-tagline {
  font-size: 1.15rem;
  max-width: 700px;
  margin: 0 auto var(--spacing-lg);
  opacity: 0.9;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  display: block;
  margin-bottom: var(--spacing-xs);
}

.stat-label {
  font-size: 0.9rem;
  opacity: 0.8;
}

.hero-cta {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
  flex-wrap: wrap;
}

.cta-button {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius-md);
  font-weight: 600;
  transition: all var(--transition-fast);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 2px solid transparent;
}

.cta-button.primary {
  background-color: var(--accent-color);
  color: var(--text-light);
  border-color: var(--accent-color);
}

.cta-button.primary:hover {
  background-color: transparent;
  color: var(--accent-color);
  border-color: var(--accent-color);
}

.cta-button.secondary {
  background-color: transparent;
  color: var(--text-light);
  border-color: rgba(255, 255, 255, 0.5);
}

.cta-button.secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: var(--text-light);
}

.sponsor-container {
  margin-top: var(--spacing-lg);
}

.scroll-indicator {
  position: absolute;
  bottom: var(--spacing-md);
  left: 50%;
  transform: translateX(-50%);
  font-size: 1.5rem;
  color: rgba(255, 255, 255, 0.7);
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(-10px);
  }
  60% {
    transform: translateY(-5px);
  }
}

/* Sticky Navigation Bar */
.navbar {
  background-color: var(--background-dark); /* Darker background for navbar */
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5); /* Darker shadow */
  padding: var(--spacing-sm) 0;
  position: sticky;
  top: 0;
  z-index: 999;
  transition: background-color var(--transition-fast), box-shadow var(--transition-fast);
}

.navbar.scrolled {
  background-color: rgba(26, 26, 26, 0.95); /* Slightly transparent dark */
  backdrop-filter: blur(5px);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  display: flex;
  align-items: center;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
}

.nav-brand .brand-icon {
  margin-right: var(--spacing-xs);
}

.nav-menu {
  list-style: none;
  display: flex;
  gap: var(--spacing-md);
}

.nav-menu a {
  color: var(--text-dark); /* Light text on dark navbar */
  font-weight: 500;
  padding: 0.5rem 0.75rem;
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.nav-menu a:hover {
  background-color: rgba(var(--primary-color), 0.1);
  color: var(--primary-color);
}

.nav-toggle {
  display: none; /* Hidden on desktop */
  flex-direction: column;
  cursor: pointer;
  gap: 5px;
  width: 30px;
  height: 20px;
}

.nav-toggle span {
  width: 100%;
  height: 3px;
  background-color: var(--text-dark); /* Light lines for toggle */
  transition: all var(--transition-fast);
  border-radius: 2px;
}

/* Mobile Nav Toggle Animation */
.nav-toggle.open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Main Content Sections */
.section {
  padding: var(--spacing-2xl) 0;
  background-color: var(--background-light); /* Main black background */
}

.highlight-section {
  background-color: var(--background-dark); /* Darker shade for highlight sections */
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: var(--spacing-sm);
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--secondary-color);
  max-width: 700px;
  margin: 0 auto;
}

/* About Section */
.about-content {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xl);
  align-items: center;
}

.about-text {
  flex: 2 1 500px; /* Allows text to take more space */
}

.welcome-badge {
  background-color: var(--primary-color);
  color: var(--text-light);
  padding: 0.4em 1em;
  border-radius: var(--border-radius-md);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: var(--spacing-md);
  font-weight: 500;
}

.intro-text {
  font-size: 1.15rem;
  margin-bottom: var(--spacing-md);
  line-height: 1.8;
}

.about-text p {
  margin-bottom: var(--spacing-sm);
}

.expertise-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-md);
}

.tag {
  background-color: var(--primary-color);
  color: var(--text-light);
  padding: 0.3em 0.8em;
  border-radius: var(--border-radius-md);
  font-size: 0.9em;
  font-weight: 500;
}

.about-visual {
  flex: 1 1 300px; /* Allows visual to take less space, but still flexible */
  display: flex;
  justify-content: center;
  align-items: center;
}

.responsive-image {
  max-width: 100%;
  height: auto;
  border-radius: var(--border-radius-lg);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3); /* Darker shadow for image */
}

/* Journey Section */
.journey-content {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xl);
  align-items: flex-start;
}

.journey-timeline {
  flex: 2 1 500px;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  position: relative;
  padding-left: var(--spacing-lg);
}

.journey-timeline::before {
  content: '';
  position: absolute;
  left: 1rem; /* Adjust to align with icons */
  top: 0;
  bottom: 0;
  width: 2px;
  background-color: var(--border-color);
}

.timeline-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  position: relative;
}

.timeline-icon {
  font-size: 1.8rem;
  background-color: var(--primary-color);
  color: var(--text-light);
  border-radius: 50%;
  width: 45px;
  height: 45px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  z-index: 1;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
  position: absolute;
  left: -22.5px; /* Half of width to center on line */
}

.timeline-content {
  background-color: var(--background-dark); /* Darker background for content cards */
  padding: var(--spacing-md);
  border-radius: var(--border-radius-md);
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
  flex: 1;
  margin-left: var(--spacing-lg); /* To make space for icon */
  transition: background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.timeline-content:hover {
  background-color: var(--background-card-hover);
  transform: translateY(-5px);
  box-shadow: 0 5px 15px var(--shadow-hover);
}

.timeline-content h3 {
  color: var(--primary-color);
  margin-bottom: var(--spacing-xs);
  font-size: 1.1rem;
}

.journey-mission {
  flex: 1 1 300px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.mission-card {
  background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
  color: var(--text-light);
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-lg);
  text-align: center;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.4);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.mission-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 30px var(--shadow-hover);
}

.mission-card .icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-sm);
}

.mission-card h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-xs);
}

/* Project Grids */
.project-grid, .geoscience-grid, .achievements-grid, .cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
}

.project-card, .geo-project-card, .achievement-card, .cert-item {
  background-color: var(--background-dark); /* Dark background for cards */
  border-radius: var(--border-radius-lg);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.project-card:hover, .geo-project-card:hover, .cert-item:hover {
  background-color: var(--background-card-hover);
  transform: translateY(-5px);
  box-shadow: 0 10px 25px var(--shadow-hover);
}

.project-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
  color: var(--primary-color); /* Default icon color */
}

.project-card h3, .geo-project-card h4 {
  font-size: 1.3rem;
  margin-bottom: var(--spacing-xs);
  color: var(--text-dark); /* Light text on dark card */
}

.project-card p, .geo-project-card p {
  font-size: 0.95rem;
  color: var(--secondary-color);
  margin-bottom: var(--spacing-md);
  flex-grow: 1; /* Allows text to take available space */
}

.project-links, .tech-stack, .project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-sm);
}

.project-link, .cert-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  background-color: #2a2a2a; /* Slightly lighter dark for links */
  color: var(--primary-color);
  padding: 0.4em 0.8em;
  border-radius: var(--border-radius-md);
  font-size: 0.9em;
  font-weight: 500;
  transition: all var(--transition-fast);
  border: 1px solid var(--border-color);
}

.project-link:hover, .cert-link:hover {
  background-color: var(--primary-color);
  color: var(--text-light);
  border-color: var(--primary-color);
}

.tech-tag, .tech-badge, .highlight-tag, .role-skills .skill-tag {
  background-color: var(--primary-color);
  color: var(--text-light);
  padding: 0.25em 0.75em;
  border-radius: var(--border-radius-sm);
  font-size: 0.8em;
  font-weight: 500;
}

/* Geoscience Project Specifics */
.geo-project-card {
  overflow: hidden;
}

.project-image {
  width: 100%;
  height: 200px; /* Fixed height for consistent image display */
  overflow: hidden;
  border-radius: var(--border-radius-md);
  margin-bottom: var(--spacing-md);
  position: relative;
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover; /* Ensures image covers the area without distortion */
  display: block;
  transition: transform var(--transition-normal);
}

.geo-project-card:hover .project-image img {
  transform: scale(1.05);
}

.project-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 123, 255, 0.8); /* Primary color with transparency */
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.geo-project-card:hover .project-overlay {
  opacity: 1;
}

.overlay-link {
  color: var(--text-light);
  font-size: 2rem;
  background-color: var(--accent-color);
  border-radius: 50%;
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast);
}

.overlay-link:hover {
  transform: scale(1.1);
}

.project-location {
  font-size: 0.9em;
  color: var(--secondary-color);
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: center;
  gap: 0.3em;
}

.category-title, .subsection-title {
  font-size: 1.6rem;
  color: var(--primary-color);
  margin-bottom: var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 600;
}

/* Seismology Projects */
.seismo-projects {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
}

.seismo-item {
  background-color: var(--background-dark); /* Dark background */
  border-radius: var(--border-radius-md);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  padding: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  transition: background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.seismo-item:hover {
  background-color: var(--background-card-hover);
  transform: translateY(-3px);
  box-shadow: 0 5px 15px var(--shadow-hover);
}

.seismo-item.featured {
  border: 2px solid var(--accent-color);
}

.seismo-icon {
  font-size: 2rem;
  color: var(--primary-color);
  flex-shrink: 0;
}

.seismo-content {
  flex-grow: 1;
}

.seismo-content h4 {
  font-size: 1.1rem;
  margin-bottom: 0.2rem;
  color: var(--text-dark);
}

.earthquake-details {
  font-size: 0.85rem;
  color: var(--secondary-color);
  margin-bottom: var(--spacing-xs);
}

.seismo-link {
  font-size: 0.9rem;
  font-weight: 600;
}

/* Workshops & Certifications */
.achievement-card {
  background-color: var(--background-dark); /* Dark background */
  border-radius: var(--border-radius-lg);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.achievement-card:hover {
  background-color: var(--background-card-hover);
  transform: translateY(-5px);
  box-shadow: 0 10px 25px var(--shadow-hover);
}

.achievement-card.major {
  background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
  color: var(--text-light);
}

.achievement-card.major:hover {
  /* For major cards, we want to keep the gradient but still show a lift */
  transform: translateY(-5px);
  box-shadow: 0 10px 25px var(--shadow-hover);
}

.achievement-card.major .achievement-icon,
.achievement-card.major h3,
.achievement-card.major p {
  color: var(--text-light);
}

.achievement-card.major .cert-link {
  background-color: rgba(255, 255, 255, 0.2);
  color: var(--text-light);
  border-color: rgba(255, 255, 255, 0.3);
}

.achievement-card.major .cert-link:hover {
  background-color: var(--text-light);
  color: var(--primary-color);
}

.achievement-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
  color: var(--primary-color);
}

.achievement-card h3 {
  font-size: 1.3rem;
  margin-bottom: var(--spacing-xs);
  color: var(--text-dark);
}

.achievement-card p {
  font-size: 0.95rem;
  color: var(--secondary-color);
  margin-bottom: var(--spacing-md);
  flex-grow: 1;
}

.internship-section {
  margin-top: var(--spacing-2xl);
}

.internship-card {
  background-color: var(--background-dark); /* Dark background */
  border-radius: var(--border-radius-lg);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  padding: var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
  flex-wrap: wrap;
  transition: background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.internship-card:hover {
  background-color: var(--background-card-hover);
  transform: translateY(-5px);
  box-shadow: 0 10px 25px var(--shadow-hover);
}

.internship-content {
  flex: 1 1 300px;
}

.internship-content h4 {
  font-size: 1.2rem;
  margin-bottom: var(--spacing-xs);
  color: var(--primary-color);
}

.internship-content p {
  font-size: 0.95rem;
  color: var(--secondary-color);
  margin-bottom: var(--spacing-md);
}

.internship-badge {
  flex-shrink: 0;
}

.badge-text {
  background-color: var(--accent-color);
  color: var(--text-light);
  padding: 0.5em 1em;
  border-radius: var(--border-radius-md);
  font-weight: 600;
  font-size: 0.9em;
}

/* Education Section */
.education-card {
  background-color: var(--background-dark); /* Dark background */
  border-radius: var(--border-radius-lg);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  padding: var(--spacing-lg);
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
  transition: background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.education-card:hover {
  background-color: var(--background-card-hover);
  transform: translateY(-5px);
  box-shadow: 0 10px 25px var(--shadow-hover);
}

.education-icon {
  font-size: 3rem;
  color: var(--primary-color);
  flex-shrink: 0;
}

.education-content {
  flex: 1 1 400px;
}

.education-content h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-xs);
  color: var(--text-dark);
}

.institution {
  font-size: 1rem;
  color: var(--secondary-color);
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: center;
  gap: 0.5em;
}

.education-description {
  font-size: 0.95rem;
  color: var(--secondary-color);
  margin-bottom: var(--spacing-md);
}

.education-highlights {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

/* Experience Section */
.experience-timeline {
  position: relative;
  padding-left: var(--spacing-lg);
}

.experience-timeline::before {
  content: '';
  position: absolute;
  left: 1rem;
  top: 0;
  bottom: 0;
  width: 2px;
  background-color: var(--border-color);
}

.experience-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  position: relative;
}

.timeline-marker {
  font-size: 1.8rem;
  background-color: var(--primary-color);
  color: var(--text-light);
  border-radius: 50%;
  width: 45px;
  height: 45px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  z-index: 1;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
  position: absolute;
  left: -22.5px;
}

.experience-content {
  background-color: var(--background-dark); /* Dark background */
  padding: var(--spacing-md);
  border-radius: var(--border-radius-md);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  flex: 1;
  margin-left: var(--spacing-lg);
  transition: background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.experience-content:hover {
  background-color: var(--background-card-hover);
  transform: translateY(-5px);
  box-shadow: 0 10px 25px var(--shadow-hover);
}

.experience-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--spacing-xs);
}

.experience-header h3 {
  font-size: 1.2rem;
  color: var(--primary-color);
}

.company {
  font-weight: 500;
  color: var(--text-dark);
}

.duration {
  font-size: 0.9em;
  color: var(--secondary-color);
}

.role-description {
  font-size: 0.95rem;
  color: var(--secondary-color);
  margin-bottom: var(--spacing-sm);
}

.role-skills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

/* Certifications Section */
.certifications-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
}

.cert-category {
  background-color: var(--background-dark); /* Dark background */
  border-radius: var(--border-radius-lg);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.cert-category:hover {
  background-color: var(--background-card-hover);
  transform: translateY(-5px);
  box-shadow: 0 10px 25px var(--shadow-hover);
}

.cert-category.featured {
  background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
  color: var(--text-light);
}

.cert-category.featured:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px var(--shadow-hover);
}

.cert-category.featured .cert-category-title,
.cert-category.featured .cert-icon,
.cert-category.featured .cert-name,
.cert-category.featured .cert-date {
  color: var(--text-light);
}

.cert-category-title {
  font-size: 1.4rem;
  color: var(--primary-color);
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 600;
}

.cert-grid {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.cert-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-xs) 0;
  transition: background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.cert-item:hover {
  background-color: var(--background-card-hover);
  transform: translateY(-3px);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

.cert-item.featured-cert {
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  font-weight: 600;
  color: var(--text-light);
}

.cert-item.featured-cert:hover {
  background-color: rgba(255, 255, 255, 0.15); /* Slightly more opaque on hover */
}

.cert-icon {
  font-size: 1.5rem;
  color: var(--primary-color);
  flex-shrink: 0;
}

.cert-name {
  font-size: 0.95rem;
  color: var(--text-dark);
  flex-grow: 1;
}

.cert-date {
  font-size: 0.85rem;
  color: var(--secondary-color);
  flex-shrink: 0;
}

/* Skills Section */
.skills-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
}

.skills-category {
  background-color: var(--background-dark); /* Dark background */
  border-radius: var(--border-radius-lg);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.skills-category:hover {
  background-color: var(--background-card-hover);
  transform: translateY(-5px);
  box-shadow: 0 10px 25px var(--shadow-hover);
}

.skills-category-title {
  font-size: 1.4rem;
  color: var(--primary-color);
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 600;
}

.skills-grid {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.skill-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  transition: background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  padding: var(--spacing-xs); /* Add padding for better hover area */
  border-radius: var(--border-radius-sm); /* Add border-radius for hover */
}

.skill-item:hover {
  background-color: #2a2a2a; /* Slightly lighter for individual skill item hover */
  transform: translateY(-3px);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

.skill-icon {
  font-size: 2rem;
  color: var(--primary-color);
  flex-shrink: 0;
}

.skill-content {
  flex-grow: 1;
}

.skill-content h4 {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-xs);
  color: var(--text-dark);
}

.skill-bar {
  width: 100%;
  height: 10px;
  background-color: #333; /* Slightly lighter dark for bar track */
  border-radius: 5px;
  overflow: hidden;
  margin-bottom: var(--spacing-xs);
}

.skill-progress {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
  width: 0%; /* Initial width for animation */
  border-radius: 5px;
  transition: width 1s ease-out;
}

.skill-level {
  font-size: 0.9rem;
  color: var(--secondary-color);
}

.soft-skills-section {
  grid-column: 1 / -1; /* Span full width on grid */
}

.soft-skills-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.soft-skill-item {
  background-color: #2a2a2a; /* Slightly lighter dark for soft skills */
  color: var(--primary-color);
  padding: 0.5em 1em;
  border-radius: var(--border-radius-md);
  font-size: 0.95em;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

.soft-skill-item:hover {
  background-color: var(--primary-color);
  color: var(--text-light);
  border-color: var(--primary-color);
  transform: translateY(-3px);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

/* Contact Section */
.contact-content {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xl);
  align-items: flex-start;
}

.contact-info {
  flex: 1 1 400px;
}

.contact-intro {
  margin-bottom: var(--spacing-lg);
}

.contact-intro h3 {
  font-size: 1.8rem;
  color: var(--primary-color);
  margin-bottom: var(--spacing-sm);
}

.contact-intro p {
  font-size: 1rem;
  color: var(--secondary-color);
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.contact-method {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  background-color: var(--background-dark); /* Dark background */
  border-radius: var(--border-radius-md);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  padding: var(--spacing-md);
  color: var(--text-dark);
  transition: background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.contact-method:hover {
  background-color: var(--background-card-hover);
  transform: translateX(5px);
  box-shadow: 0 5px 15px var(--shadow-hover);
}

.contact-icon {
  font-size: 1.8rem;
  color: var(--primary-color);
  flex-shrink: 0;
}

.contact-details h4 {
  font-size: 1.1rem;
  margin-bottom: 0.2rem;
  color: var(--text-dark);
}

.contact-details span {
  font-size: 0.9rem;
  color: var(--secondary-color);
}

.contact-visual {
  flex: 1 1 400px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.university-map {
  width: 100%;
  max-width: 500px; /* Adjust as needed */
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.contact-cta {
  text-align: center;
  margin-top: var(--spacing-2xl);
}

.cta-content h3 {
  font-size: 1.8rem;
  color: var(--primary-color);
  margin-bottom: var(--spacing-sm);
}

.cta-content p {
  font-size: 1.1rem;
  color: var(--secondary-color);
  margin-bottom: var(--spacing-lg);
}

.cta-button.large {
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: 1.1rem;
}

/* Footer */
.footer {
  background-color: var(--background-dark); /* Dark background for footer */
  color: var(--text-light);
  padding: var(--spacing-xl) 0;
  text-align: center;
}

.footer-content {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
  text-align: left; /* Align columns left */
}

.footer-brand {
  flex: 1 1 200px;
}

.footer-brand h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-xs);
  color: var(--text-light);
}

.footer-brand p {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.7);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xl);
  flex: 2 1 400px; /* Allow links to take more space */
  justify-content: space-around;
}

.footer-column {
  flex: 1 1 120px;
}

.footer-column h4 {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-sm);
  color: var(--text-light);
}

.footer-column ul {
  list-style: none;
  padding: 0;
}

.footer-column li {
  margin-bottom: var(--spacing-xs);
}

.footer-column a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.95rem;
  transition: color var(--transition-fast);
}

.footer-column a:hover {
  color: var(--text-light);
}

.social-links {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-sm);
}

.social-links a {
  color: var(--text-light);
  font-size: 1.5rem;
  transition: transform var(--transition-fast), color var(--transition-fast);
}

.social-links a:hover {
  transform: translateY(-3px);
  color: var(--accent-color);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-md);
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.6);
}

.footer-tagline {
  font-style: italic;
  margin-top: var(--spacing-xs);
}

/* Back to Top Button */
.back-to-top {
  position: fixed;
  right: var(--spacing-md);
  bottom: var(--spacing-md);
  background-color: var(--primary-color);
  color: var(--text-light);
  border: none;
  border-radius: 50%;
  width: 50px;
  height: 50px;
  font-size: 1.5rem;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  z-index: 998;
  opacity: 0; /* Hidden by default */
  pointer-events: none;
}

.back-to-top.show {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top:hover {
  background-color: var(--accent-color);
  transform: translateY(-3px);
}


/* Responsive Design */
@media (max-width: 992px) {
  .hero-title {
    font-size: 2.8rem;
  }
  .hero-subtitle {
    font-size: 1.1rem;
  }
  .section-title {
    font-size: 2rem;
  }
  .nav-menu {
    gap: var(--spacing-sm);
  }
  .about-content, .journey-content, .contact-content {
    flex-direction: column;
  }
  .journey-timeline::before, .experience-timeline::before {
    left: 0.5rem;
  }
  .timeline-icon, .timeline-marker {
    left: -15px; /* Adjust for smaller screens */
  }
  .timeline-content, .experience-content {
    margin-left: var(--spacing-lg); /* Maintain gap */
  }
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
  .footer-links {
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
  }
  .footer-column {
    flex: none; /* Remove flex basis */
    width: 100%;
  }
  .footer-column ul {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm);
  }
  .social-links {
    justify-content: center;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.2rem;
  }
  .hero-subtitle {
    font-size: 1rem;
  }
  .hero-stats {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  .cta-button {
    width: 100%;
    justify-content: center;
  }
  .nav-menu {
    display: none; /* Hide nav menu by default on mobile */
    flex-direction: column;
    width: 100%;
    background-color: var(--background-dark); /* Dark background for mobile nav */
    position: absolute;
    top: 100%;
    left: 0;
    box-shadow: 0 5m rgba(0, 0, 0, 0.3);
    padding: var(--spacing-sm) 0;
  }
  .nav-menu.open {
    display: flex;
  }
  .nav-toggle {
    display: flex; /* Show toggle button on mobile */
  }
  .nav-menu li {
    width: 100%;
  }
  .nav-menu a {
    padding: var(--spacing-xs) var(--spacing-md);
    width: 100%;
  }
  .project-grid, .geoscience-grid, .achievements-grid, .certifications-container, .skills-container {
    grid-template-columns: 1fr; /* Single column layout */
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.8rem;
  }
  .hero-subtitle {
    font-size: 0.9rem;
  }
  .section-title {
    font-size: 1.8rem;
  }
  .avatar-container {
    width: 120px;
    height: 120px;
  }
  .stat-number {
    font-size: 2rem;
  }
  .cta-button.large {
    font-size: 1rem;
    padding: var(--spacing-sm) var(--spacing-md);
  }
  .contact-method {
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-xs);
  }
  .contact-icon {
    margin-bottom: var(--spacing-xs);
  }
}